2 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/completion.h>
34 #include <linux/file.h>
35 #include <linux/mutex.h>
36 #include <linux/poll.h>
37 #include <linux/idr.h>
39 #include <linux/in6.h>
40 #include <linux/miscdevice.h>
41 #include <linux/smp_lock.h>
43 #include <rdma/rdma_user_cm.h>
44 #include <rdma/ib_marshall.h>
45 #include <rdma/rdma_cm.h>
47 MODULE_AUTHOR("Sean Hefty");
48 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
49 MODULE_LICENSE("Dual BSD/GPL");
52 UCMA_MAX_BACKLOG = 128
58 struct list_head ctx_list;
59 struct list_head event_list;
60 wait_queue_head_t poll_wait;
65 struct completion comp;
70 struct ucma_file *file;
71 struct rdma_cm_id *cm_id;
74 struct list_head list;
75 struct list_head mc_list;
78 struct ucma_multicast {
79 struct ucma_context *ctx;
84 struct list_head list;
86 u8 pad[sizeof(struct sockaddr_in6) -
87 sizeof(struct sockaddr)];
91 struct ucma_context *ctx;
92 struct ucma_multicast *mc;
93 struct list_head list;
94 struct rdma_cm_id *cm_id;
95 struct rdma_ucm_event_resp resp;
98 static DEFINE_MUTEX(mut);
99 static DEFINE_IDR(ctx_idr);
100 static DEFINE_IDR(multicast_idr);
102 static inline struct ucma_context *_ucma_find_context(int id,
103 struct ucma_file *file)
105 struct ucma_context *ctx;
107 ctx = idr_find(&ctx_idr, id);
109 ctx = ERR_PTR(-ENOENT);
110 else if (ctx->file != file)
111 ctx = ERR_PTR(-EINVAL);
115 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
117 struct ucma_context *ctx;
120 ctx = _ucma_find_context(id, file);
122 atomic_inc(&ctx->ref);
127 static void ucma_put_ctx(struct ucma_context *ctx)
129 if (atomic_dec_and_test(&ctx->ref))
130 complete(&ctx->comp);
133 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
135 struct ucma_context *ctx;
138 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
142 atomic_set(&ctx->ref, 1);
143 init_completion(&ctx->comp);
144 INIT_LIST_HEAD(&ctx->mc_list);
148 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
153 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
155 } while (ret == -EAGAIN);
160 list_add_tail(&ctx->list, &file->ctx_list);
168 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
170 struct ucma_multicast *mc;
173 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
178 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
183 ret = idr_get_new(&multicast_idr, mc, &mc->id);
185 } while (ret == -EAGAIN);
191 list_add_tail(&mc->list, &ctx->mc_list);
199 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
200 struct rdma_conn_param *src)
202 if (src->private_data_len)
203 memcpy(dst->private_data, src->private_data,
204 src->private_data_len);
205 dst->private_data_len = src->private_data_len;
206 dst->responder_resources =src->responder_resources;
207 dst->initiator_depth = src->initiator_depth;
208 dst->flow_control = src->flow_control;
209 dst->retry_count = src->retry_count;
210 dst->rnr_retry_count = src->rnr_retry_count;
212 dst->qp_num = src->qp_num;
215 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
216 struct rdma_ud_param *src)
218 if (src->private_data_len)
219 memcpy(dst->private_data, src->private_data,
220 src->private_data_len);
221 dst->private_data_len = src->private_data_len;
222 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
223 dst->qp_num = src->qp_num;
224 dst->qkey = src->qkey;
227 static void ucma_set_event_context(struct ucma_context *ctx,
228 struct rdma_cm_event *event,
229 struct ucma_event *uevent)
232 switch (event->event) {
233 case RDMA_CM_EVENT_MULTICAST_JOIN:
234 case RDMA_CM_EVENT_MULTICAST_ERROR:
235 uevent->mc = (struct ucma_multicast *)
236 event->param.ud.private_data;
237 uevent->resp.uid = uevent->mc->uid;
238 uevent->resp.id = uevent->mc->id;
241 uevent->resp.uid = ctx->uid;
242 uevent->resp.id = ctx->id;
247 static int ucma_event_handler(struct rdma_cm_id *cm_id,
248 struct rdma_cm_event *event)
250 struct ucma_event *uevent;
251 struct ucma_context *ctx = cm_id->context;
254 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
256 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
258 uevent->cm_id = cm_id;
259 ucma_set_event_context(ctx, event, uevent);
260 uevent->resp.event = event->event;
261 uevent->resp.status = event->status;
262 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
263 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
265 ucma_copy_conn_event(&uevent->resp.param.conn,
268 mutex_lock(&ctx->file->mut);
269 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
276 } else if (!ctx->uid) {
278 * We ignore events for new connections until userspace has set
279 * their context. This can only happen if an error occurs on a
280 * new connection before the user accepts it. This is okay,
281 * since the accept will just fail later.
287 list_add_tail(&uevent->list, &ctx->file->event_list);
288 wake_up_interruptible(&ctx->file->poll_wait);
290 mutex_unlock(&ctx->file->mut);
294 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
295 int in_len, int out_len)
297 struct ucma_context *ctx;
298 struct rdma_ucm_get_event cmd;
299 struct ucma_event *uevent;
303 if (out_len < sizeof uevent->resp)
306 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
309 mutex_lock(&file->mut);
310 while (list_empty(&file->event_list)) {
311 mutex_unlock(&file->mut);
313 if (file->filp->f_flags & O_NONBLOCK)
316 if (wait_event_interruptible(file->poll_wait,
317 !list_empty(&file->event_list)))
320 mutex_lock(&file->mut);
323 uevent = list_entry(file->event_list.next, struct ucma_event, list);
325 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
326 ctx = ucma_alloc_ctx(file);
331 uevent->ctx->backlog++;
332 ctx->cm_id = uevent->cm_id;
333 ctx->cm_id->context = ctx;
334 uevent->resp.id = ctx->id;
337 if (copy_to_user((void __user *)(unsigned long)cmd.response,
338 &uevent->resp, sizeof uevent->resp)) {
343 list_del(&uevent->list);
344 uevent->ctx->events_reported++;
346 uevent->mc->events_reported++;
349 mutex_unlock(&file->mut);
353 static ssize_t ucma_create_id(struct ucma_file *file,
354 const char __user *inbuf,
355 int in_len, int out_len)
357 struct rdma_ucm_create_id cmd;
358 struct rdma_ucm_create_id_resp resp;
359 struct ucma_context *ctx;
362 if (out_len < sizeof(resp))
365 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
368 mutex_lock(&file->mut);
369 ctx = ucma_alloc_ctx(file);
370 mutex_unlock(&file->mut);
375 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
376 if (IS_ERR(ctx->cm_id)) {
377 ret = PTR_ERR(ctx->cm_id);
382 if (copy_to_user((void __user *)(unsigned long)cmd.response,
383 &resp, sizeof(resp))) {
390 rdma_destroy_id(ctx->cm_id);
393 idr_remove(&ctx_idr, ctx->id);
399 static void ucma_cleanup_multicast(struct ucma_context *ctx)
401 struct ucma_multicast *mc, *tmp;
404 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
406 idr_remove(&multicast_idr, mc->id);
412 static void ucma_cleanup_events(struct ucma_context *ctx)
414 struct ucma_event *uevent, *tmp;
416 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
417 if (uevent->ctx != ctx)
420 list_del(&uevent->list);
422 /* clear incoming connections. */
423 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
424 rdma_destroy_id(uevent->cm_id);
430 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
432 struct ucma_event *uevent, *tmp;
434 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
435 if (uevent->mc != mc)
438 list_del(&uevent->list);
443 static int ucma_free_ctx(struct ucma_context *ctx)
447 /* No new events will be generated after destroying the id. */
448 rdma_destroy_id(ctx->cm_id);
450 ucma_cleanup_multicast(ctx);
452 /* Cleanup events not yet reported to the user. */
453 mutex_lock(&ctx->file->mut);
454 ucma_cleanup_events(ctx);
455 list_del(&ctx->list);
456 mutex_unlock(&ctx->file->mut);
458 events_reported = ctx->events_reported;
460 return events_reported;
463 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
464 int in_len, int out_len)
466 struct rdma_ucm_destroy_id cmd;
467 struct rdma_ucm_destroy_id_resp resp;
468 struct ucma_context *ctx;
471 if (out_len < sizeof(resp))
474 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
478 ctx = _ucma_find_context(cmd.id, file);
480 idr_remove(&ctx_idr, ctx->id);
487 wait_for_completion(&ctx->comp);
488 resp.events_reported = ucma_free_ctx(ctx);
490 if (copy_to_user((void __user *)(unsigned long)cmd.response,
491 &resp, sizeof(resp)))
497 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
498 int in_len, int out_len)
500 struct rdma_ucm_bind_addr cmd;
501 struct ucma_context *ctx;
504 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
507 ctx = ucma_get_ctx(file, cmd.id);
511 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
516 static ssize_t ucma_resolve_addr(struct ucma_file *file,
517 const char __user *inbuf,
518 int in_len, int out_len)
520 struct rdma_ucm_resolve_addr cmd;
521 struct ucma_context *ctx;
524 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
527 ctx = ucma_get_ctx(file, cmd.id);
531 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
532 (struct sockaddr *) &cmd.dst_addr,
538 static ssize_t ucma_resolve_route(struct ucma_file *file,
539 const char __user *inbuf,
540 int in_len, int out_len)
542 struct rdma_ucm_resolve_route cmd;
543 struct ucma_context *ctx;
546 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
549 ctx = ucma_get_ctx(file, cmd.id);
553 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
558 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
559 struct rdma_route *route)
561 struct rdma_dev_addr *dev_addr;
563 resp->num_paths = route->num_paths;
564 switch (route->num_paths) {
566 dev_addr = &route->addr.dev_addr;
567 ib_addr_get_dgid(dev_addr,
568 (union ib_gid *) &resp->ib_route[0].dgid);
569 ib_addr_get_sgid(dev_addr,
570 (union ib_gid *) &resp->ib_route[0].sgid);
571 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
574 ib_copy_path_rec_to_user(&resp->ib_route[1],
575 &route->path_rec[1]);
578 ib_copy_path_rec_to_user(&resp->ib_route[0],
579 &route->path_rec[0]);
586 static ssize_t ucma_query_route(struct ucma_file *file,
587 const char __user *inbuf,
588 int in_len, int out_len)
590 struct rdma_ucm_query_route cmd;
591 struct rdma_ucm_query_route_resp resp;
592 struct ucma_context *ctx;
593 struct sockaddr *addr;
596 if (out_len < sizeof(resp))
599 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
602 ctx = ucma_get_ctx(file, cmd.id);
606 memset(&resp, 0, sizeof resp);
607 addr = &ctx->cm_id->route.addr.src_addr;
608 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
609 sizeof(struct sockaddr_in) :
610 sizeof(struct sockaddr_in6));
611 addr = &ctx->cm_id->route.addr.dst_addr;
612 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
613 sizeof(struct sockaddr_in) :
614 sizeof(struct sockaddr_in6));
615 if (!ctx->cm_id->device)
618 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
619 resp.port_num = ctx->cm_id->port_num;
620 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
621 case RDMA_TRANSPORT_IB:
622 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
629 if (copy_to_user((void __user *)(unsigned long)cmd.response,
630 &resp, sizeof(resp)))
637 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
638 struct rdma_ucm_conn_param *src)
640 dst->private_data = src->private_data;
641 dst->private_data_len = src->private_data_len;
642 dst->responder_resources =src->responder_resources;
643 dst->initiator_depth = src->initiator_depth;
644 dst->flow_control = src->flow_control;
645 dst->retry_count = src->retry_count;
646 dst->rnr_retry_count = src->rnr_retry_count;
648 dst->qp_num = src->qp_num;
651 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
652 int in_len, int out_len)
654 struct rdma_ucm_connect cmd;
655 struct rdma_conn_param conn_param;
656 struct ucma_context *ctx;
659 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
662 if (!cmd.conn_param.valid)
665 ctx = ucma_get_ctx(file, cmd.id);
669 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
670 ret = rdma_connect(ctx->cm_id, &conn_param);
675 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
676 int in_len, int out_len)
678 struct rdma_ucm_listen cmd;
679 struct ucma_context *ctx;
682 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
685 ctx = ucma_get_ctx(file, cmd.id);
689 ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
690 cmd.backlog : UCMA_MAX_BACKLOG;
691 ret = rdma_listen(ctx->cm_id, ctx->backlog);
696 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
697 int in_len, int out_len)
699 struct rdma_ucm_accept cmd;
700 struct rdma_conn_param conn_param;
701 struct ucma_context *ctx;
704 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
707 ctx = ucma_get_ctx(file, cmd.id);
711 if (cmd.conn_param.valid) {
713 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
714 ret = rdma_accept(ctx->cm_id, &conn_param);
716 ret = rdma_accept(ctx->cm_id, NULL);
722 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
723 int in_len, int out_len)
725 struct rdma_ucm_reject cmd;
726 struct ucma_context *ctx;
729 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
732 ctx = ucma_get_ctx(file, cmd.id);
736 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
741 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
742 int in_len, int out_len)
744 struct rdma_ucm_disconnect cmd;
745 struct ucma_context *ctx;
748 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
751 ctx = ucma_get_ctx(file, cmd.id);
755 ret = rdma_disconnect(ctx->cm_id);
760 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
761 const char __user *inbuf,
762 int in_len, int out_len)
764 struct rdma_ucm_init_qp_attr cmd;
765 struct ib_uverbs_qp_attr resp;
766 struct ucma_context *ctx;
767 struct ib_qp_attr qp_attr;
770 if (out_len < sizeof(resp))
773 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
776 ctx = ucma_get_ctx(file, cmd.id);
780 resp.qp_attr_mask = 0;
781 memset(&qp_attr, 0, sizeof qp_attr);
782 qp_attr.qp_state = cmd.qp_state;
783 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
787 ib_copy_qp_attr_to_user(&resp, &qp_attr);
788 if (copy_to_user((void __user *)(unsigned long)cmd.response,
789 &resp, sizeof(resp)))
797 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
798 void *optval, size_t optlen)
803 case RDMA_OPTION_ID_TOS:
804 if (optlen != sizeof(u8)) {
808 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
817 static int ucma_set_option_level(struct ucma_context *ctx, int level,
818 int optname, void *optval, size_t optlen)
824 ret = ucma_set_option_id(ctx, optname, optval, optlen);
833 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
834 int in_len, int out_len)
836 struct rdma_ucm_set_option cmd;
837 struct ucma_context *ctx;
841 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
844 ctx = ucma_get_ctx(file, cmd.id);
848 optval = kmalloc(cmd.optlen, GFP_KERNEL);
854 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
860 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
869 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
870 int in_len, int out_len)
872 struct rdma_ucm_notify cmd;
873 struct ucma_context *ctx;
876 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
879 ctx = ucma_get_ctx(file, cmd.id);
883 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
888 static ssize_t ucma_join_multicast(struct ucma_file *file,
889 const char __user *inbuf,
890 int in_len, int out_len)
892 struct rdma_ucm_join_mcast cmd;
893 struct rdma_ucm_create_id_resp resp;
894 struct ucma_context *ctx;
895 struct ucma_multicast *mc;
898 if (out_len < sizeof(resp))
901 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
904 ctx = ucma_get_ctx(file, cmd.id);
908 mutex_lock(&file->mut);
909 mc = ucma_alloc_multicast(ctx);
916 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
917 ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc);
922 if (copy_to_user((void __user *)(unsigned long)cmd.response,
923 &resp, sizeof(resp))) {
928 mutex_unlock(&file->mut);
933 rdma_leave_multicast(ctx->cm_id, &mc->addr);
934 ucma_cleanup_mc_events(mc);
937 idr_remove(&multicast_idr, mc->id);
942 mutex_unlock(&file->mut);
947 static ssize_t ucma_leave_multicast(struct ucma_file *file,
948 const char __user *inbuf,
949 int in_len, int out_len)
951 struct rdma_ucm_destroy_id cmd;
952 struct rdma_ucm_destroy_id_resp resp;
953 struct ucma_multicast *mc;
956 if (out_len < sizeof(resp))
959 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
963 mc = idr_find(&multicast_idr, cmd.id);
965 mc = ERR_PTR(-ENOENT);
966 else if (mc->ctx->file != file)
967 mc = ERR_PTR(-EINVAL);
969 idr_remove(&multicast_idr, mc->id);
970 atomic_inc(&mc->ctx->ref);
979 rdma_leave_multicast(mc->ctx->cm_id, &mc->addr);
980 mutex_lock(&mc->ctx->file->mut);
981 ucma_cleanup_mc_events(mc);
983 mutex_unlock(&mc->ctx->file->mut);
985 ucma_put_ctx(mc->ctx);
986 resp.events_reported = mc->events_reported;
989 if (copy_to_user((void __user *)(unsigned long)cmd.response,
990 &resp, sizeof(resp)))
996 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
998 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1000 mutex_lock(&file1->mut);
1001 mutex_lock(&file2->mut);
1003 mutex_lock(&file2->mut);
1004 mutex_lock(&file1->mut);
1008 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1010 if (file1 < file2) {
1011 mutex_unlock(&file2->mut);
1012 mutex_unlock(&file1->mut);
1014 mutex_unlock(&file1->mut);
1015 mutex_unlock(&file2->mut);
1019 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1021 struct ucma_event *uevent, *tmp;
1023 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1024 if (uevent->ctx == ctx)
1025 list_move_tail(&uevent->list, &file->event_list);
1028 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1029 const char __user *inbuf,
1030 int in_len, int out_len)
1032 struct rdma_ucm_migrate_id cmd;
1033 struct rdma_ucm_migrate_resp resp;
1034 struct ucma_context *ctx;
1036 struct ucma_file *cur_file;
1039 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1042 /* Get current fd to protect against it being closed */
1043 filp = fget(cmd.fd);
1047 /* Validate current fd and prevent destruction of id. */
1048 ctx = ucma_get_ctx(filp->private_data, cmd.id);
1054 cur_file = ctx->file;
1055 if (cur_file == new_file) {
1056 resp.events_reported = ctx->events_reported;
1061 * Migrate events between fd's, maintaining order, and avoiding new
1062 * events being added before existing events.
1064 ucma_lock_files(cur_file, new_file);
1067 list_move_tail(&ctx->list, &new_file->ctx_list);
1068 ucma_move_events(ctx, new_file);
1069 ctx->file = new_file;
1070 resp.events_reported = ctx->events_reported;
1073 ucma_unlock_files(cur_file, new_file);
1076 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1077 &resp, sizeof(resp)))
1086 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1087 const char __user *inbuf,
1088 int in_len, int out_len) = {
1089 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1090 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1091 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
1092 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1093 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1094 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1095 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1096 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1097 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1098 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1099 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1100 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1101 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1102 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1103 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1104 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1105 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1106 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1107 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
1110 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1111 size_t len, loff_t *pos)
1113 struct ucma_file *file = filp->private_data;
1114 struct rdma_ucm_cmd_hdr hdr;
1117 if (len < sizeof(hdr))
1120 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1123 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1126 if (hdr.in + sizeof(hdr) > len)
1129 if (!ucma_cmd_table[hdr.cmd])
1132 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1139 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1141 struct ucma_file *file = filp->private_data;
1142 unsigned int mask = 0;
1144 poll_wait(filp, &file->poll_wait, wait);
1146 if (!list_empty(&file->event_list))
1147 mask = POLLIN | POLLRDNORM;
1152 static int ucma_open(struct inode *inode, struct file *filp)
1154 struct ucma_file *file;
1156 file = kmalloc(sizeof *file, GFP_KERNEL);
1161 INIT_LIST_HEAD(&file->event_list);
1162 INIT_LIST_HEAD(&file->ctx_list);
1163 init_waitqueue_head(&file->poll_wait);
1164 mutex_init(&file->mut);
1166 filp->private_data = file;
1172 static int ucma_close(struct inode *inode, struct file *filp)
1174 struct ucma_file *file = filp->private_data;
1175 struct ucma_context *ctx, *tmp;
1177 mutex_lock(&file->mut);
1178 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1179 mutex_unlock(&file->mut);
1182 idr_remove(&ctx_idr, ctx->id);
1186 mutex_lock(&file->mut);
1188 mutex_unlock(&file->mut);
1193 static const struct file_operations ucma_fops = {
1194 .owner = THIS_MODULE,
1196 .release = ucma_close,
1197 .write = ucma_write,
1201 static struct miscdevice ucma_misc = {
1202 .minor = MISC_DYNAMIC_MINOR,
1207 static ssize_t show_abi_version(struct device *dev,
1208 struct device_attribute *attr,
1211 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1213 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1215 static int __init ucma_init(void)
1219 ret = misc_register(&ucma_misc);
1223 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1225 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1230 misc_deregister(&ucma_misc);
1234 static void __exit ucma_cleanup(void)
1236 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1237 misc_deregister(&ucma_misc);
1238 idr_destroy(&ctx_idr);
1241 module_init(ucma_init);
1242 module_exit(ucma_cleanup);